Magic items that give more daily wildshifts

[Arabesu]

I'm playing a Shifter (Eberron) Swashbuckler in a savage tide campaign and I was wondering how one would price/construct an item that gives more shiftings per day. Obviously it would get better at higher levels, but wouldn't be as good at low levels. So it'd need some sort of way to scale the price I'd reckon. Is such an item out there in any of the published books?

Arabesu

 

[hanniball]

I don't know of any items published that does such, but the Druid's Vestments add one daily use of Wild Shape an it's only 10,000gp. I'd say that's a pretty fair price for Wild Shape and an item suiting your purposes could be priced similarily for shifting.